I've order the antenna from eu.banggood.com to be delivered in one week instead of one month.
Before I had for the 868Mhz band an 8.2 cm wire (1/4 wave lenght) converted from an 2.4Ghz WiFi antenna. I've used only the base to be able to mount it on the gateway and I've soldered to wire.
|Old home made antenna vs the new 2dB|
The full setup needs just a proper waterproof case to be mounted outside.
|Both antennas in place|
GPS is working, I see the coordinates and altitude but more important now I am ready for class B and for precise downlink messages from my Network Server.